# Boston, MA 02110-1301, USA.
#
-import pylab, math
+import scipy
from pylab import *
-import struct, sys
from optparse import OptionParser
-import gr_read_binary
+matplotlib.interactive(True)
+matplotlib.use('TkAgg')
+
+class draw_fft:
+ def __init__(self, filename, options):
+ self.hfile = open(filename, "r")
+ self.block_length = options.block
+ self.start = options.start
+ self.sample_rate = options.sample_rate
+
+ self.axis_font_size = 16
+ self.label_font_size = 18
+ self.title_font_size = 20
+ self.text_size = 22
+
+ # Setup PLOT
+ self.fig = figure(1, figsize=(16, 9), facecolor='w')
+ rcParams['xtick.labelsize'] = self.axis_font_size
+ rcParams['ytick.labelsize'] = self.axis_font_size
+
+ self.text_file = figtext(0.10, 0.94, ("File: %s" % filename), weight="heavy", size=self.text_size)
+ self.text_file_pos = figtext(0.10, 0.88, "File Position: ", weight="heavy", size=self.text_size)
+ self.text_block = figtext(0.40, 0.88, ("Block Size: %d" % self.block_length),
+ weight="heavy", size=self.text_size)
+ self.text_sr = figtext(0.60, 0.88, ("Sample Rate: %.2f" % self.sample_rate),
+ weight="heavy", size=self.text_size)
+ self.make_plots()
+
+ self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)
+ self.button_left = Button(self.button_left_axes, "<")
+ self.button_left_callback = self.button_left.on_clicked(self.button_left_click)
+
+ self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)
+ self.button_right = Button(self.button_right_axes, ">")
+ self.button_right_callback = self.button_right.on_clicked(self.button_right_click)
+
+ self.xlim = self.sp_iq.get_xlim()
+
+ self.manager = get_current_fig_manager()
+ connect('key_press_event', self.click)
+ show()
+
+ def get_data(self):
+ self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//8))
+ self.iq = scipy.fromfile(self.hfile, dtype=scipy.complex64, count=self.block_length)
+ #print "Read in %d items" % len(self.iq)
+ if(len(self.iq) == 0):
+ print "End of File"
+ else:
+ self.reals = [r.real for r in self.iq]
+ self.imags = [i.imag for i in self.iq]
+ self.time = [i*(1/self.sample_rate) for i in range(len(self.reals))]
+
+ def make_plots(self):
+ # if specified on the command-line, set file pointer
+ self.hfile.seek(16*self.start, 1)
+
+ self.get_data()
+
+ # Subplot for real and imaginary parts of signal
+ self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.14, 0.85, 0.67])
+ self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")
+ self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")
+ self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")
+ self.plot_iq = plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')
+ self.sp_iq.set_ylim([1.5*min([min(self.reals), min(self.imags)]),
+ 1.5*max([max(self.reals), max(self.imags)])])
+
+ draw()
+
+ def update_plots(self):
+ self.plot_iq[0].set_data([self.time, self.reals])
+ self.plot_iq[1].set_data([self.time, self.imags])
+ self.sp_iq.set_ylim([1.5*min([min(self.reals), min(self.imags)]),
+ 1.5*max([max(self.reals), max(self.imags)])])
+ draw()
+
+ def click(self, event):
+ forward_valid_keys = [" ", "down", "right"]
+ backward_valid_keys = ["up", "left"]
+
+ if(find(event.key, forward_valid_keys)):
+ self.step_forward()
+
+ elif(find(event.key, backward_valid_keys)):
+ self.step_backward()
+
+ def button_left_click(self, event):
+ self.step_backward()
+
+ def button_right_click(self, event):
+ self.step_forward()
+
+ def step_forward(self):
+ self.get_data()
+ self.update_plots()
+
+ def step_backward(self):
+ # Step back in file position
+ if(self.hfile.tell() >= 16*self.block_length ):
+ self.hfile.seek(-16*self.block_length, 1)
+ else:
+ self.hfile.seek(-self.hfile.tell(),1)
+ self.get_data()
+ self.update_plots()
+
+
+
+#FIXME: there must be a way to do this with a Python builtin
+def find(item_in, list_search):
+ for l in list_search:
+ if item_in == l:
+ return True
+ return False
def main():
- usage="%prog: [options] output_filename"
- parser = OptionParser(conflict_handler="resolve", usage=usage)
- parser.add_option("-s", "--size", type="int", default=None,
- help="Specify the number of points to plot [default=%default]")
- parser.add_option("", "--skip", type="int", default=None,
- help="Specify the number of points to skip [default=%default]")
+ usage="%prog: [options] input_filename"
+ description = "Takes a GNU Radio complex binary file and displays the I&Q data versus time. You can set the block size to specify how many points to read in at a time and the start position in the file. By default, the system assumes a sample rate of 1, so in time, each sample is plotted versus the sample number. To set a true time axis, set the sample rate (-R or --sample-rate) to the sample rate used when capturing the samples."
+ parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)
+ parser.add_option("-B", "--block", type="int", default=1000,
+ help="Specify the block size [default=%default]")
+ parser.add_option("-s", "--start", type="int", default=0,
+ help="Specify where to start in the file [default=%default]")
+ parser.add_option("-R", "--sample-rate", type="float", default=1.0,
+ help="Set the sampler rate of the data [default=%default]")
+
(options, args) = parser.parse_args ()
if len(args) != 1:
parser.print_help()
raise SystemExit, 1
filename = args[0]
- iq = gr_read_binary.read_complex_binary(filename)
-
- if(options.skip is None):
- options.skip = 0
-
- if((options.size is None) or ((options.skip+options.size) > len(iq[0]))):
- options.size = len(iq[0]) - options.skip
-
- reals = iq[0][options.skip : options.skip + options.size]
- imags = iq[1][options.skip : options.skip + options.size]
- x = range(options.skip, options.skip + options.size)
-
- # PLOT REAL AND IMAGINARY PARTS
-
- f = figure(1, figsize=(16, 12), facecolor='w')
- rcParams['xtick.labelsize'] = 16
- rcParams['ytick.labelsize'] = 16
-
- sp1 = f.add_subplot(1,1,1)
- sp1.set_title(("I&Q"), fontsize=26, fontweight="bold")
- sp1.set_xlabel("Time (s)", fontsize=20, fontweight="bold")
- sp1.set_ylabel("Amplitude (V)", fontsize=20, fontweight="bold")
- plot(x, reals, 'bo-', x, imags, 'ro-')
-
- show()
+ dc = draw_fft(filename, options)
if __name__ == "__main__":
try:
projects / debian / gnuradio / blobdiff